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ST72561AR7-Auto Datasheet(PDF) 264 Page - STMicroelectronics |
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ST72561AR7-Auto Datasheet(HTML) 264 Page - STMicroelectronics |
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264 / 324 page  Instruction set ST72561-Auto 264/324 Doc ID 12370 Rev 8 19 Instruction set 19.1 CPU addressing modes The CPU features 17 different addressing modes which can be classified in seven main groups: The CPU Instruction set is designed to minimize the number of bytes required per instruction: To do so, most of the addressing modes may be subdivided in two submodes called long and short: ● Long addressing mode is more powerful because it can use the full 64 Kbyte address space, however it uses more bytes and more CPU cycles. ● Short addressing mode is less powerful because it can generally only access page zero (0000h - 00FFh range), but the instruction size is more compact, and faster. All memory to memory instructions use short addressing modes only (CLR, CPL, NEG, BSET, BRES, BTJT, BTJF, INC, DEC, RLC, RRC, SLL, SRL, SRA, SWAP) The ST7 Assembler optimizes the use of long and short addressing modes. Table 94. Addressing mode groups Addressing mode Example Inherent nop Immediate ld A, #$55 Direct ld A, $55 Indexed ld A, ($55,X) Indirect ld A, ([$55],X) Relative jrne loop Bit operation bset byte, #5 Table 95. CPU addressing mode overview Mode Syntax Destination Pointer address (hex.) Pointer size (hex.) Length (bytes) Inherent nop + 0 Immediate ld A, #$55 + 1 Short Direct ld A, $10 00..FF + 1 Long Direct ld A, $1000 0000..FFFF + 2 No Offset Direct Indexed ld A, (X) 00..FF + 0 Short Direct Indexed ld A, ($10,X) 00..1FE + 1 Long Direct Indexed ld A, ($1000,X) 0000..FFFF + 2 Short Indirect ld A, [$10] 00..FF 00..FF byte + 2 Long Indirect ld A, [$10.w] 0000..FFFF 00..FF word + 2 |
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